🚀 go-pugleaf

>Yet an other question, about dynamic variation of a sound.
>I'd like to know how are named the diferent phases of the envelope
>of a sound (or a wave in general). 

Envelopes are usually realized by approximating a curve with a
"piecewise linear function", which just means that the curve is made
to fit to a line made up of straight line segments.  This is sometimes
called a break-point-envelope, and can theoretically contain any
number of segments.  The number of segments implemented in the
hardware of a synthesizer is limited, and depends on the model, as
well as on the function of the envelope.  For example, the Proteus
Alternate Volume Envelope has 5 stages (segments): Attack, Hold,
Decay, Sustain and Release.  The shape produced is usually something
like this:

     ______
    /      \
   /        \
  /          \______
 /                  \
/                    \
 A     H   D    S   R    

Iannis.